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        HLLAPI (High-Level Language API)

        Entry:
          ??? -> parameter control block

        Return:
          ???

        Format of parameter control block:

        Offset  Size    Description
         00h  3 BYTEs   signature = 'PCB'
         03h    BYTE    function number
         04h    WORD    segment of control string
         06h    WORD    offset of control string
         08h    WORD    length of control string, unless explicit end-of-str char set
         0Ah    BYTE    unused
         0Bh    WORD    return code
         0Dh    WORD    maximum length of control string

        Functions:

         00h    Query system (Attachmate implementation only)
         01h    Connect presentation space
         02h    Disconnect presentation space
         03h    Send string of keystrokes as if typed from keyboard
         04h    Wait ~60s, returns status of presentation space
         05h    Copy current presentation space into a user-defined buffer
         06h    Search presentation space for first occurrence of a specified string
         07h    Query cursor location in current presentation space
         08h    Copy part or all of current presentation space into user buffer
         09h    Set session parameters; parameters vary by vendor
         0Ah    Get info on sessions currently connected
         0Bh    Lock current presentation space
         0Ch    Unlock previously locked presentation space
         0Dh    Return copy of operator info area (OIA) of current presentation space
         0Eh    get attribute byte for given position in the current presentation space
         0Fh    copy string of characters to the current presentation space
         10h    workstation control functions
         11h    storage manager functions, intended primarily for BASIC applications
         12h    set delay period in half-second intervals
         14h    get info on level of workstation support used
         15h    reset session parameters to default values
         16h    get detailed info on the current session
         17h    start host notification to application on presentation sp or OIA update
         18h    check host update when host notification enabled
         19h    stop host notification
         1Eh    search field within current presentation space for string
         1Fh    get first positionof a selected field in the current presentation space
         20h    get length of specified field
         21h    copy string into a specified field
         22h    copy specified field into a user-defined buffer
         23h    create alternate presentation space (IBM only), don't use with BASIC
         24h    switch to alternate presentation space (IBM only), not with BASIC
         25h    display cursor in specified area (IBM only), don't use with BASIC
         26h    display alternate presentation space (IBM only), don't use with BASIC
         27h    delete alternate presentation space (IBM only), don't use with BASIC
         32h    start intercepting keystrokes to allow filtering
         33h    get keystrokes after turning on interception
         34h    notify operator when keystroke rejected by filter subroutine
         35h    stop intercepting keystrokes
         5Ah    send file
         5Bh    receive file
         5Ch    run a program
         5Dh    execute DOS command
         63h    change presentation space position to PC display row/col or vice versa
         FFh    Get info on DCA implementation

        Session Parameters for function 09h:
         ATTRIB         return attributes in hex
         NOATTRIB       return attributes as blanks
         CONPHYS        make physical connection
         CONLOG         only make logical connection
         EAB            copy extended attribute bytes along with data
         NOEAB          copy data only
         ESC=n          set escape character to "n" (default '@')
         EOT=n          set end of string character (default 00h)
         FPAUSE         full-duration pause
         IPAUSE         interruptible pause
         STRLEN         use explicit string lengths
         STREOT         use terminated strings
         SRCHALL        search entire presentation space
         SRCHFROM       search from specified offset
         SRCHFRWD       search forward from position 1
         SRCHBKWD       search backward from last position in presentation space
         TWAIT          wait specified time for keyboard ready
         LWAIT          wait until keyboard ready
         NWAIT          no wait
         TRON           enable tracing
         TROFF          disable tracing
         AUTORESET      send reset before sending keys with function 03h
         NORESET        don't send reset
         QUIET          don't display messages sent with INT 21/AH=9
         NOQUIET        allow messages to be displayed
         TIMEOUT=n      set timeout in 30-second intervals, 0 = wait until reak
         XLATE          translate extended attribute bytes
         NOXLATE        don't translate
         NEWRET         use HLLAPI v3.0 return code conventions
         OLDRET         use HLLAPI v2.0 return code conventions